hifi engine

Looking for Service manual for Marantz 3200 Pre-amp

Hi Today:
I have a Marantz 3200 Pre-amp that works on only one Channel.. It appears that the circuit board behind the Volume control is not working properly.. It began by intermittently working and now only one channel works.. Could there be a quick fix? OR should transistors and/or signal caps be replaced?? I am unable to find the schematic.. I have downloaded the 3250 manual in hopes that the circuit board /schematic is similar.. ?? Not quite, but close.. Looking for suggestions-and-help.. Thank you to anyone that may have experience with this Pre-amp?

For anyone that might help, I can be reached at ax056@chebucto.ns.ca

Thank you ..